Geohistorical Stratigraphy and Stratigraphic Guides

Ganelin, V. G.; Gladenkov, Yu. B.

doi:10.1134/s0869593818020028

Cited by 2 publications

(3 citation statements)

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“…Thus, based on the findings of this species at the base of the Ogonerian Regional Stage of the Kolyma-Omolon Region, V.G. Ganelin [17] identified the Insignis Lone (provincial zone), which is well traced on the Omolon Massif and beyond. In Western Verkhoyanie, when J. insignis occurred in the monotonous section of the Echij Formation, it became possible to draw the boundary between the Khorokytian and Echian Regional Stages [18], although there have been no ammonoid finds [19].…”

Section: Resultsmentioning

confidence: 95%

“…terechovi were discovered in clay sandstones and coarse-grained siltstones. J. terechovi is characterized by zonal distribution for both the Kolyma-Omolon Region (the middle part of the Ogonerian Regional Stage) [17] and Verkhoyanie (the lower part of the Echian Regional Stage) [7]. On the right bank of the lower reaches of the Lena River (Kubalakh section), the lower part of the Member 4 of the Tuora-Sis Formation rich in representatives of the index species is assigned to the Terechovi Zone.…”

Section: Resultsmentioning

confidence: 99%

“…The Rugosus Zone was identified by V.G. Ganelin [21] on the Omolon Massif (Munugudzhak River) as the uppermost biostratigraphic unit of the Munugudzhakian Regional Stage, further considered as a superstage [1,17]. In Verkhoyanie, the representatives of J. rugosus were recorded in the Echij Formation of the Orulgan Ridge (upper reaches of the Sobolokh-Mayan River) and in the upper part of the Tuora-Sis Formation (upper part of the Member 4) [7].…”

Section: Resultsmentioning

confidence: 99%

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Asselian–Sakmarian Brachiopod Zonation of the Left Bank of the Lower Reaches of the Lena River, Northeast Russia

Makoshin¹,

Kutygin²

2022

Uch. Zap. Kazan. Univ. Ser. Estestv. Nauki

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This article summarizes the results of our study of the Early Permian brachiopods collected 5.9-6.3 km northwest of the village of Chekurovka that were used to develop the first biostratigraphic zonation of the Asselian-Sakmarian deposits on the left bank of the lower reaches of the Lena River. At the base of the Permian section, the Jakutoproductus lenensis Beds were identified. They are overlain by the Jakutoproductus insignis Zone with numerous shells of the index species. The Jakutoproductus terechovi and Jakutoproductus rugosus Zones, which are characterized by index species, occur even higher in the section. The boundary between the Khorokytian and Echian Regional Stages is defined by the first occurrence of J. insignis at the base of the Insignis Zone. The identified zonal sequence is identical to the previously studied Kubalakh section on the right bank of the lower reaches of the Lena River. However, the thickness of the biostratigraphic zones on the left bank is reduced by half, and a significant lower part of the Khorokytian Regional Stage (below the Lenensis Beds) is missing because it falls on the stratigraphic break between the Cambrian and Permian deposits. The zonation performed shows that there is a direct correlation between the Chekurovka section and the Asselian-Sakmarian deposits of Western Verkhoyanie and the Omolon Massif due to common index species of the biostratigraphic units.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%